Ive had a headache in the base of my skull for two weeks then afew days ago I was rubbing back head and noticed hard stationary lump that is very sore when touched seems to be related?

It's important to see a doctor or healthcare provider if you have a headache that lasts for more than two weeks, especially if it is accompanied by a hard, stationary lump on the back of your head that is sore to the touch. This could be a sign of a serious underlying medical condition, such as a brain tumor or infection. The doctor can perform tests to determine the cause of your headache and lump and recommend appropriate treatment. Self-treating or ignoring these symptoms can be dangerous, so it's best to seek professional medical advice as soon as possible.